Researchers warn of a rising “assassination culture” after killings of Charlie Kirk, Brian Thompson; prosecutors fear copycats

Researchers and federal officials warn a rising “assassination culture” may be emerging in the U.S., where high‑profile political killings — including the Sept. 10, 2025 death of Charlie Kirk and the killing of Brian Thompson — could inspire copycat attacks.

Key takeaways

• High‑profile killings can produce a contagion or copycat effect amplified by social media and viral footage.
• Federal prosecutors have singled out a suspect, Luigi Mangione, as an example of how publicity may spur more attackers.
• Researchers recommend stronger event security, improved information sharing, measured enforcement of online threats, and public education about contagion risks.
• San Diego implications include economic, political and social consequences for local events, campuses and civic life.

Main coverage

Key information

Charlie Kirk, a conservative activist, was fatally shot on Sept. 10, 2025, while speaking at Utah Valley University in Orem, Utah. The shooter fired from a rooftop about 142 yards away; the suspect, Tyler James Robinson, was arrested and later indicted on murder charges with prosecutors alleging political motivation and seeking the death penalty. Researchers and officials cite the Shooting of Charlie Kirk as a flashpoint for contagion concerns.

Killing of Charlie Kirk: facts and fallout

On Sept. 10, 2025, Kirk was struck in the neck while speaking at Utah Valley University’s Losee Center in Orem. The attack occurred from an elevated position roughly 142 yards away; the suspect, identified as 22‑year‑old Tyler James Robinson, was arrested two days later and indicted for murder.

The killing touched off a national debate: supporters and conservative leaders condemned the act as politically motivated, while law enforcement and university officials quickly moved to secure other public events. Researchers and civil liberties experts warn the rapid spread of footage and commentary can magnify risks by granting notoriety and attention to perpetrators.

Killing of Brian Thompson: pattern without full public record

Brian Thompson’s murder has been discussed alongside Kirk’s in reporting and commentary as part of a larger pattern of targeted political violence. Public reporting provided for this article included limited detail on Thompson’s case; analysts nevertheless use both incidents to illustrate how isolated attacks can signal a wider, worrying trend often described as part of “America’s age of salad‑bar extremism” (see the podcast discussion linked below).

Federal prosecutors’ warning: Luigi Mangione and contagion fears

Federal prosecutors have publicly warned that high‑profile attackers can inspire more violence through the attention their acts receive. A suspect named Luigi Mangione has been cited by prosecutors as someone who could prompt copycat attacks; detailed public reporting on Mangione was limited in the source materials reviewed for this article. Prosecutors’ warnings align with research showing how publicity, ideology and social media magnify contagion risks.

Researchers’ alarm: escalation, contagion, and policing of speech

Researchers identify four linked dynamics increasing the danger of further attacks:

• Escalation cycle: Each high‑profile attack can feed fear, calls for retaliation and heightened tensions that push fringe actors toward violence.
• Contagion effect: Widespread coverage and viral content can inspire actors seeking fame, revenge or ideological validation.
• Policing of discourse: Employers, universities and law enforcement often take swift action against those seen to praise or encourage violence — measures that can prevent harm but raise civil liberties concerns.
• Threat to democratic life: Growing risks of targeted political violence can chill free speech, reduce public gatherings and make civic participation more hazardous.

What researchers recommend

Security specialists and researchers advise a combination of tactical and policy steps to reduce contagion risk:

• Strengthen event security with improved site scans, observation of potential vantage points and controlled access for speakers and audiences (see the Shooting of Charlie Kirk reporting for context).
• Improve information sharing between local police and federal investigators when online threats or planning activity appear.
• Balance enforcement and speech protections to address credible threats and celebrations of violence while preserving lawful expression.
• Educate platforms and the public about contagion risks so coverage and moderation minimize the chance of inspiring additional attackers (see the podcast discussion below).

Implications for San Diego, California

Economic impact: Public events and paid speaking engagements help San Diego’s economy. Heightened fear can reduce attendance at rallies, conventions and cultural events, affecting hotels, restaurants and local vendors. Universities and conference organizers may face higher security costs, making large events harder to host.

Political consequences: Local campaigns, candidate appearances and town halls may need increased security and altered formats. Politicians could moderate rhetoric to avoid inflaming tensions, which in turn can narrow public debate and change campaign dynamics.

Social effects: Campuses and community groups may see heightened security and surveillance of online speech. Fears of reprisal could discourage civic engagement and complicate public discourse across San Diego’s diverse communities.

Cultural relevance: San Diego’s tradition of open forums and public festivals may be affected; balanced local reporting and civic leadership can help calm tensions and limit contagion by avoiding sensationalized coverage of attackers.

Practical applications for San Diego residents

• Event organizers should conduct security reviews, consider controlled access and coordinate vantage‑point surveillance with local law enforcement.
• Universities and community centers should remind attendees of safety plans and reporting channels for suspicious activity.
• Residents can help protect civic life by reporting credible threats, avoiding sharing graphic or sensational content that amplifies an attacker’s notoriety, and supporting measured, community‑led responses.

Sources and further reading

Primary sources used for this article include the Wikipedia entry Shooting of Charlie Kirk and the podcast episode Charlie Kirk’s killing and America’s age of salad‑bar extremism.

Note: Public reporting on the Brian Thompson killing and detailed reporting on Luigi Mangione was limited in the materials provided. Where public records are incomplete, this article cites researchers’ analyses and prosecutors’ statements as summarized in the sources above.